وَلَا تَتَّخِذُوٓاْ أَيْمَـٰنَكُمْ دَخَلاَۢ بَيْنَكُمْ فَتَزِلَّ قَدَمُۢ بَعْدَ ثُبُوتِهَا وَتَذُوقُواْ ٱلسُّوٓءَ بِمَا صَدَدتُّمْ عَن سَبِيلِ ٱللَّهِۖ وَلَكُمْ عَذَابٌ عَظِيمٌ ٩٤
Make not your oaths a deceit between you, lest a foot should slip after being firmly planted and ye should taste evil forasmuch as ye debarred (men) from the way of Allah, and yours should be an awful doom.